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Determination of calcium and magnesium ions by colorimetric titration:


  • Collect 10 mL of the water to be analyzed and transfer to a 25 mL beaker.
  • Add 3 mL of pH 10 buffer solution under an extraction hood and a spatula tip of EBT. The solution takes on a red-purple color.
  • Titrate the solution obtained with EDTA at 10-2 mol/L while vigorously stirring the solution.
  • The equivalence point is reached when the red-purple color disappears in favor of the blue color of EBT released in solution.
Illustration of a chronometer ≈ 20 minutes / sample
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